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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90be4ce71de1f23fee246c5d4bb74b3d0790749d4e666f406c7fc1ca5f381329' 
  AND token = 'MqUfkZMdalsJ837a9QQqKgvNsOI6/BEUeC9Kpv2DoDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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