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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '939cabfe2bc1e6c5220b73d085b56009f1ff44418a5ccab26f24ee9d828e743e' 
  AND token = 'm1igI0PEnqqXW/egM2S9YSKDlWYnY/yBzynBbx7Lyiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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