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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '647b923a827711d7f39e9c3ed29f4d293088c3ba1cc16c3bfcae97976d019939' 
  AND token = 'L08bYRwewHlJQWx7GgKWWWEBPwCzr2IM7nYZeb7362E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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