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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e55ffb9a55315989ed0d9c4c6f1db12b021cb5287fa94961949b92800784536' 
  AND token = '3zfjbSqmcbBEj5f3qVJADB3yVzwzStOKGR8u88Z5I3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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