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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f34f247c883490b690e486ef3fe2bb472c466c268453b8e9aca5ed6b440fd7d' 
  AND token = 'xeFL3t8kBRMz2MjYuhNO48fEGWMASq8tNx+KBxfHzfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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