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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f3200b327d1fae3bb2414578e6f0c3dfad9419650dfa3b92b4e59f89c4fd6f' 
  AND token = 'rcVla/xZUgD6aDLg1qlc8t2g+0X25H3vbLIXJI+xYrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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