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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '964c176a47c6a0ae8b073f05bd3ff3fe384728782f15c142bebc00a981c15745' 
  AND token = '+42BGe0ky93uKfcVQW+7Iqjich5YFD/g0tn5+iZyv+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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