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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff7e6e1365c9d86da1d52d087fcdf02ba3c780d47c6e1dd233a674c40fb120e7' 
  AND token = '05u9WI41vlUcnlCVqWtQHJM3vR0jpGMhb8+pcHw/U2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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