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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '817028709c5c5a715f277d67f5bb9d16469c8dbf4769d649424ca648f72c50b3' 
  AND token = 'vw8wEz7wkDcmjoyN9HgQXxmT7yxlo7pecTzm65gnemc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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