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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb8ccaf43e15f8e964b39fda2c7d4fe367616cbc932bda4d832393d7b11d078' 
  AND token = 'TubT5aIU8vTbQ7e88IVGeffZPlzkvdeDWEIDY6QJGJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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