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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e44e3efd7c5539a8a5b8b580f54ae1e177b3598df9e4e974424e5963999e289e' 
  AND token = 'Tz4a3nlkC9et5JpT2LMixdfh4OwsswLXsYHrrpmCjuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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