SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac13faddc78cc310181b48ad57567d0fd2eb84c9b9c5dc230632a54277c2063' 
  AND token = '5MzQvsrKj/1PyTZzS02+C6vTDbVfOC05J1D7yYT3KFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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