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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b81ae492a28c04f84dbad08bd92cd5b0f61b545eba8fd02a9238af7f76e9b9e' 
  AND token = 'hNfxkRg38EaqANz53pUw/HyxAXoM0SVudJsaZFvQ3Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}