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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5de32fa69bbd0ceef97239e56ad9b1a3d47c38f82024dbfb0c7ba74e880314e7' 
  AND token = 'ATZeG0mPoXqtOZmyBUeo0JviciAYRU0F6+BBJMIQRIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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