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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '325ef2a84eed7fc41a2e3c211b1c748034d6404709af1a6e76b316d02fae5823' 
  AND token = '2y0dx7s5G9D64ascnXCDZnkxFcv5cVzqTAg7WCpZNhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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