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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d3d1fd8db604de38e789879abba43e0c7f99117d6104d63558344f9be886e5' 
  AND token = 'AHNZxWs4NTb4HfpvCKl1XDKp4B7Tib4k1I6M/XkwY6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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