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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd11359e0f2821bb10cc1afec9a319ae7a63823d8b6efaba0e01bdcf9fbadd93c' 
  AND token = 'EDHEsqH8AvK9Be61XWMgqOrraNtAvbwvkFc2T2lIZH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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