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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '447cbf52ad235b0ba5ed13a2a5c7dbf22670d5b473b4546456a4b620b45db876' 
  AND token = '058ZkGIAbkb3cjwzS50/Vh/FsyO0I/JkheEyXx5xshw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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