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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '727298b73189f44346745df88c89be982c99b951caeaedeebc2a11a3c1d6b147' 
  AND token = 'kscYheJdRxoD0mHw7xjvTy3WeX9WQCZ3RW5bghTiRho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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