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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0914e5bf643ff01474f0cad3902a1638a58ddf6c8b18a4979a648b4b36ce8af6' 
  AND token = '3QleWQjTvQ5l+y74ahD3avkyHPrIq8ZZoK7Os0u/1F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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