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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdf6d8c0b5a4e2117ce6c233f4e212c77e3ed381306b8a9216a52d77fa4433d8' 
  AND token = 'n6mFoU5YmoHPrb9Ohch0evIDyGBSl+vA3qJXayOsbe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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