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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '954b246b0511538f4a627bdc21d6571d28ff8b316e76cd633f8d5b43cf83e481' 
  AND token = 'LuNGkQyN+u85MxV4f+DVPwDKMENjudUhyQsDnGl3m9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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