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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '956a3bdb14713498c876a1465687e5e53b9ecceaef5888a7bc1b8fc23ca84cf7' 
  AND token = 'nPlSEXdmpZ7iV1yE7fK3j+bTUdbkCcFf5Og9MP7t26U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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