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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a440174d218e37a898f6ef6cede42e8c16f12dfa9791a9eafe3e77e2ceab3770' 
  AND token = '6qTYco996L0mQlXXEyav9v5V1eHIVa760hqZKNK8c/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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