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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '028518f3ec3ec8a59deaafa2c510adb370b62bfa0f7604cfd802fa13b21fa2f4' 
  AND token = 'C4oz/zdGdwiFIkCKb5ZfERbuVn1CXmLXH6NXus95pdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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