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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aec8d840fc2623f46ee0d362d0124d90821678520a155b83dccbbc8b8ee73ab' 
  AND token = 'isbYW8ntl8Lkf/71iVXt14rRZw1d8NolwD5UlE58Bgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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