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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d9986a3f1fd5393512b1e43a4a25257d35fe18a4bd5f9e9ddc44e8e9e812fd8' 
  AND token = '9u084R/l+HuTRi902V8CzdXFXK/FLT2Yg4+a2/ljugs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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