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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd82cc534a7e355b484358fdbae83553d376661c8535dd6d7726bfdb5b830b929' 
  AND token = 'zNf6p64gMhtWIEgmYxlRx390Ohht888Ho2+8CtHU8qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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