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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a38db6053d8503a6e33dc34a70a64c2c9abe95bde1d30df3c92157e32f0246' 
  AND token = 'mYiAKQ99FKSeLoH6o102Wa4g6oHKf+xTNR72+S+IQPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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