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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8549023e9d2286115c2c51580bc5486add7406b4500ae93aae99011f22284f8e' 
  AND token = '4ctMfZ2yK1tvQS7TmatbaU2NwjT5rIisfQWzRx7Ij0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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