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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e49c411459622354a6aa5c951b9b46b651810b9153fa90e0af08c3fe2d4d3f30' 
  AND token = 'V0obV9eGWBBu2W/b0KK/GqFHSrFvKiF0iLR6A9WMEy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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