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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba1f23518c81a75995c3c38c1eb00be3b406c8d97a2140001becf2a6927a96ba' 
  AND token = 'ETCzeo6RboLOgSZut5BrZEQFwW6QiMD0mkZv5egk8NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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