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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab4bf2a2669ee747a1320f74eb0145ef02fa33a38f8963fe6dee13903a8a0f5d' 
  AND token = 'TBgFgouvbDnQnFpeaMT/Uow8Qnr8/ja39CtA+djX0WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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