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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b81936ecf1288b9f372b4d5c86fc380b3cf4d063b6ae39ae36c09bdc5eee9c5' 
  AND token = 'PG/xR9aG63FF7BAVa9LTOmoiuyZ406IdWRqUGELq4X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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