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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '692e0d8ce474c0061b3c0118025cb00dab38ede76c93fd1bf58833ec24ca1ed3' 
  AND token = 'D0jb9P2S2WXCG/i4RpUv8DvgPflM50AV8KKQRbZsCL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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