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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '588101b0bdecbb1496499960d05425bf1f60493195115ff009f5a1b4677a7a05' 
  AND token = 'L1Satqk+CQweHSvVdeZEZ22aj9X/Zu4C7hn+sviGD6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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