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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d40ef3cc7dc74258c2c126f5d6d81e706e978e919ccb11b46cfc770cf32de07' 
  AND token = 'cS4ZK6wCRCQpt5CRkdOgp6At49cy70ksQzQe8UTGz2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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