SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48bafe60cb1f0910d3e6d5d7748faa73aaf71633a3a2ca10ff076a4d3238462b' 
  AND token = 'GKq+yn/Bcn+J0zYVnh0U/mObqmjxvPGVZfpx/wY3F+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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