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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39b9c32e947bd946ea745a7f77f3c2e94f558fcacba68766734a8b7d83cbb003' 
  AND token = 'kc0hhg5SxerJlDYPaGApLHJahmZ+ou+37QWIs1Z3tLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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