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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce652c1428ffede10fe0de6da9a4ae8297c3aa22f190c8b94f7b47f91ebf9a1' 
  AND token = '3bBd4ROzYoEC76wo8jhfQ5vWQGQDoO6u/d1XRXX9QEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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