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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6cb645a02166383f911b5ec1da64a94c28f01bb201912ebaa71926a25f33bd3' 
  AND token = 'PyFJI2SsWtXaaOGQRMybp2SAryeqnLvY0Csr1nPhe3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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