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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b95569633ff61633fda5c69644017a605d2e0014a8b63be1bf0c6aff88c77e6' 
  AND token = 'qQzb+yf90JGnTalVRSONhISwFWn/6K/Td3JT67M0L6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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