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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3eff9decac5286d4dda1ffbbb7cd35b0dbd8334266ab35e0c899f2ba51c49a3' 
  AND token = 'cnAPKXu3hQQsV5nJFpXMLOzU03OJmZ+hydRfThB77+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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