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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed240830127cecf4b6ae287d13d2e84a0676da9c7419f92d513e8852c4486187' 
  AND token = 'rkyI9VZzYjSFgrL6x7a7le/1BROe3drURkM1lXoauws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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