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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18ac4bf16bc65833fa5c15ca3b6b64140d03aa5003547035413bf1409760b1d3' 
  AND token = 'pdY61mLotsCJ9xU7NcptIXu/ysga8fsTByPR2yvjYXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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