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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '608c99b3b5d2519d7bdbd37b9654851fea6c0dbdf22519b0d33b94bc0f9f40ec' 
  AND token = '2fiz+XIYA8984mVsw/jMeoHc9DuslcFjsS+e01qB7wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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