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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5f1b8e7ac75cdcf709854b85eca216132baf2fbab95ff3325912e7ba75ece9f' 
  AND token = '7kBwx5lH2oSew/gUQBl5C/DI49QGMQkfs65jkfgZeHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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