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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec71f74d675b5455fc9289c8e14f74e05d1e46b988edb834a6b40d327ae7332b' 
  AND token = 'NsJGRYuT5Bt7QPkeJAJfk54dfC+K1O9r3+Pej4BmwDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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