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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c82b85497bed0d2502aa40e41b3322f8c64c9ff43e985415a6baab5cc6b7b8e2' 
  AND token = 'gWaVpsk3jLgleJe1g93n1h9TTR2d2WBDXwrCKApMCi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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