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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e5c3ceace6391a4e5961aeb6367b9086f248bae020dcc05d9bc1e60c9db9828' 
  AND token = 'vgTUtZsESi07tn3nJkj5/H/24NAL4NSlLvCT/AmwO0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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