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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3638ea28d2aa23cb62393fbea3fdff68b9bc1fa62ea479ed2ef355431096a526' 
  AND token = 'CeCq7qbW4A9QB7GR1vULaZc5I6x8cvp4tetOESDKzvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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