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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29b72ec501aa5273d62cc4ef6b12dd347c4e1338d122fcd5c0d7df17793f341f' 
  AND token = 'UYcKanxOvLLV7XTHHmb9X9w7myICXAop7PqxXzGiTeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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