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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d11c1a86ce576ad410d0114a14cee8dc3326ed150a402f7a48874a33600d7ee' 
  AND token = 'kpVebZnP6ZZ/QkCM99G0oLLJsYalEQ0sUmoG9mOKDzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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