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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3591d2e6194acf30f9952b32d007e61b188c7e1ebf47661b7fdbf86cf29a40' 
  AND token = '3EjdFK4TrTcr/C/MQhUcUrE+7b40lUDohocesebE7x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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