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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f4a4d2bda04a1d4331f80f1a471c8c45fe97ec57f4fee1b92b91e96e94be08' 
  AND token = 'fevoIZ12wluzPvSGa26+xiwq5G+tDEspL3iDQarJ+z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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