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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1da4ec95c4b684619e1a3386dd6ec49ac369c50b740083d8e732ec69676b36ee' 
  AND token = 'qUdbCbqz/Fjoj2CrxUVtR9nNAINDA4VV6jA9nMA0BsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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