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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf06e291b61eeab62abc02c7483774403c052c37bf7e9fc75ed5023ef2efb2bf' 
  AND token = 'QS8u6Lw8WsY9XX9su0s3ojHUid18eVyvHhu84OEhYlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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