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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63b61521fdc83b8a159c22a79af92ef7c0a0957622f8b9b46ce6e063fdf9173e' 
  AND token = '1uXKr+KkPlkfc8gqYxkyHyAdpfqESRCJ+Ubo9pxhR5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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