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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c26fc77c48e5fc1d796b38dfc89dca45bb17cf9b8b39095cab114cb28c56727a' 
  AND token = 'h97Oi42H5YRkN8exTCdPoozthPwf6plR76io1gANuQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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