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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee9aee233e16e434a7e1eabf15239d404de794255e89549e2de79e748e15432' 
  AND token = 'ZqgBdp8tdiWL0lqLqeMiBmghuxyvFCTQX2vnmP6lCBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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