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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcaebda49d406e491641e1a7b1d710d9b2856a24c0f2aea33137a9b47f73f739' 
  AND token = 'P/r9PV47yzbeO2KOdqbsdO+5D6vMkr3MLjJMSlCSmRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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