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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a1a6e37d49484ea8aae4b6b2b6562c62f9db0f40b9eb698b4e55be3edb83798' 
  AND token = 'VD6Txvd67zyq1U1GGPXbpY3ydAGIEAP8Ymkpn8NUv5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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