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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f3322215ea38e853eca7bce95e0323fc559db3b8dcc20f981f92e10f3f15da1' 
  AND token = 'DXjm+TcsFTJT6wCdpPShIJNEwSKBbs9JusHAN4yweRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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