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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ad54fa0fbbb8e9d7a4b7190874c868980a60996549a7c14f68f12ab86faff9' 
  AND token = '50eYBgHQxiLfbNd5BZ1wQAF27lz4H6Tt06I2M3/3uGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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