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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '251db54e1c315d1f55dba8cf19f3839efda5901b083aa0192e948dc844e933ce' 
  AND token = 'iidk4BxJ4XJknHh5uHRI1O3Zb1B2V3uHQ5GtJkholR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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