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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d49bea1a792fd0797d63d3be2331cc9e73277f11ba83a53dc6eed227cd7c24f' 
  AND token = '+m0vr3OVg6QmK0yO/c6YVHz5D76vWJAW7GhZWMVJ7t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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